Apparatus for distributing RF signals and AC power to taps

• US 5,581,801 A
• Filed: 03/22/1995
• Issued: 12/03/1996
• Est. Priority Date: 03/22/1995
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Scientific-Atlanta Incorporated (Cisco Systems, Inc.)
• Inventors: Dale, James L., Collmus, Robert S., Spriester, Bart, Herrmann, Gregory L.
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): GRANT, CHRISTOPHER C
• Application Number:
  US08/408,529
• Time in Patent Office: 622 Days
• Field of Search: 348/6, 348/8, 348/10, 348/11, 348/12, 348/13, 455/3.2, 455/3.1, 455/4.1, 455/4.2, 455/5.1, 455/6.1, 455/6.2, 455/3.3
• US Class Current: 725/149
• CPC Class Codes: H01R 31/005 Intermediate parts for distributing signals
• CPC Class Codes: H04N 7/102 Circuits therefor, e.g. noise reducers, equalisers, amplifiers H04N7/108 takes precedence
• CPC Class Codes: H04N 7/104 Switchers or splitters
• CPC Class Codes: H04N 7/16 Analogue secrecy systems; Analogue subscription systems

Abstract

A method and system for distributing multimedia signals to a subscriber from a headend unit. The multimedia signals are transmitted on a network media as a composite RF and AC signal. A passive unit is upgraded by with a circuit having connectors that separates the AC from the RF signal. The signals are split in the upgraded passive unit. The AC signal is fed to a power distribution unit which generates an AC output signal that is surge protected, RF filtered and current limited. The RF signal and AC output signal are separately fed to a customer interface unit where the RF signal is decoded and transmitted to a subscriber. By providing a passive unit where the AC and RF signal are separated in the same unit, the system can be upgraded with a power distribution unit when AC signals are required to supply power to subscriber equipment.

Claims

1. A system for distributing multimedia information from a headend unit to a subscriber, the system comprising:

1) a network media operative to distribute a composite AC power signal and RF signal, wherein the RF signal contains multimedia information originating from the headend;

2) a tap including;

a) a composite input terminal coupled to said network media for receiving said composite signal,

b) a plurality of RF output terminals to which said RF signal received by said composite input terminal is fed, and

c) an AC output terminal to which said AC signal received by said composite input terminal is distributed;

3) a power distribution unit including;

a) an input terminal connected to said AC output terminal via a power line and receiving the AC power signal on said power line,

b) a plurality of AC output terminals to which the received AC power signal is fed; and

c) a limiter disposed within said power distribution unit and operative to limit a maximum output current of the AC power signal fed to the AC output terminals.

2. The system as recited in claim 1 further comprising:

an RF subscriber media coupled to one Of said plurality of RF output terminals for distributing said RF signal;

an AC subscriber media coupled to one of said plurality of AC output terminals for distributing the AC power signal; and

a customer interface unit coupled to the home of the subscriber, the AC subscriber media and the RF subscriber media, said customer interface unit having a RF input terminal for receiving the RF signal from one of the output terminals on the tap and having an AC input terminal receiving the AC power signal, said customer interface unit decoding the RF signal into subscriber signals and retransmitting the RF signal onto a plurality of different subscriber transmission lines.

3. The system as recited in claim 1 further wherein the tap has a faceplate and a rear plate, and wherein power distribution unit is removable connected to the tap between the face plate and the rear plate.

4. An apparatus for distributing a composite AC and RF signal transmitted over a network media, the apparatus comprising:

1) a tap including;

a) a rear plate having a composite input terminal coupled to said network media through which said composite signal is received and having a composite output terminal through which said composite signal is distributed to said network media;

b) an RF circuit electrically coupled to said composite input terminal and operative to split the RF signal from the composite signal;

b) a face plate operative to engage with the rear plate and having an RF output terminal connected thereto to which said split RF signal is fed; and

2) a power distribution unit (PDU) disposed between said rear plate and said faceplate, said PDU including;

a) a power distribution circuit coupled to said input terminal and splitting the AC power signal from the composite signal;

b) a plurality of AC output terminals to which the AC power signal is fed; and

c) a limiter disposed within said power distribution unit and operative to limit a maximum output current of the AC power signal fed to the AC output terminals.

5. The apparatus as recited in claim 4 wherein said RF circuit is attached to said faceplate.

6. The apparatus as recited in claim 4 wherein said PDU contains a plurality of connectors for removably engaging said faceplate from said PDU.

7. The apparatus as recited in claim 6 further comprising means mounted on said PDU for electrically connecting said composite input terminal to said composite output terminal when said tap is disengaged from said PDU.

8. The apparatus as recited in claim 7 further comprising means for disconnecting said composite input terminal from said composite output terminal when said tap is reengaged with said PDU.

9. An apparatus for distributing a composite AC and RF signal transmitted over a network media, the apparatus comprising:

a rear plate having a composite input terminal coupled to the network media through which the composite signal is received and having a composite output terminal through which the composite signal is distributed;

a circuit, electrically coupled to said composite input terminal, operative to split the AC power signal and the RF signal from the composite signal;

a face plate operative to engage with said rear plate and having a plurality of RF output terminals connected thereto to which the split RF signal is fed;

a plurality of AC output terminals to which the split AC power signal is fed; and

a limiter electrically coupled to said circuit and operative to limit an output current of the split AC power signal fed to the AC output terminals.

10. The apparatus as recited in claim 9 wherein the RF output terminals are physically separated from the AC output terminals.

11. The apparatus as recited in claim 9 wherein the circuit is coupled to the face plate and has a receptacle that engages with the composite input terminal.

12. The apparatus as recited in claim 9 further comprising:

means for permitting said face plate to disengage from said rear plate; and

means for electrically shorting said composite input terminal to said composite output terminal when said face plate is disengaged from said rear plate.